package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书！");
        //1.先找到你删除的图书是否存在
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的图书的姓名： ");
        String name = scanner.nextLine();//水浒传
        int currentSize = bookList.getUsedSize();
        int delIndex = -1;
        int i = 0;
        for (; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if(book.getName().equals(name)) {
                System.out.println("找到这本书了！开始删除");
                delIndex = i;
                break;
            }
        }
        if(i == currentSize) {
            System.out.println("没有找到你要删除的书！");
            //删除的方法：用后面的覆盖删除这个位置的东西
            return;
        }
        for (int j = delIndex; j < currentSize - 1; j++) {
            Book book = bookList.getBook(j+1);
            bookList.setBooks(j,book);//这就是将j+1的书给到j下标中
        }
        bookList.setBooks(currentSize - 1,null);//将currentSize的位置置为null
        bookList.setUsedSize(currentSize-1);
        System.out.println("删除图书成功！");
    }
}
